No, Subscribers can't update the information seen by people who are not logged in.
There are two different types of accounts on TrailDamage.com. Members have gone wheeling with us at least once, and Subscribers have not gone wheeling with us. Only Members who have been on at least three trail days with us can post reports and update trails. To become a Member, you must be sponsored by a current Member and invited to an upcoming trail run. To request sponsorship, just subscribe and post in the forum made especially for that type of request.
Why not let subscribers update trails and post reports? We pride ourselves on accurate information, and everything here has been verified by club Members. If we allowed anyone and everyone to update it, we would not be able to verify that it was accurate. There are other websites out there where you can post your reports and trail information, and we recommend that you post there. You'll notice that the information on those sites is pretty unreliable. For example, someone new to wheeling will think a 4-rated trail should be a 7, while someone who has been offroading for years will think it should be a 2. You can trust that all of our ratings are relative to the ratings for the rest of the trails on this site, so you can use them as a guide.